Markham Vineyards operates in St. Helena, the heart of Napa Valley's Cabernet country. The winery's portfolio centers on bold red wines that reflect the region's volcanic soils and warm days. Rockerbox Vineyard Cabernet Sauvignon, the flagship expression, demonstrates the depth and structure that define St. Helena fruit. Blue Boots, a Bordeaux-style blend of Petit Verdot, Malbec, Merlot, Cabernet Franc, and Cabernet Sauvignon, shows the winery's command of varietal composition and balance. A Malbec from Yountville Ranch Vineyard rounds out the core range, offering a different angle on the region's potential. Wine Enthusiast, Wine Advocate, and Decanter have all rated these wines, with the Rockerbox Cabernet and Blue Boots earning particular recognition among prestige critics.